 /*******************************************************************************
  * Copyright (c) 2005, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.texteditor.quickdiff.compare.equivalence;

 /**
  * Value objects. Subclasses must override <code>equals</code> and are
  * typically <code>final</code>.
  *
  * @since 3.2
  */
 public abstract class Hash implements Cloneable {
     
     public Object clone() {
         try {
             return super.clone();
         } catch (CloneNotSupportedException x) {
             throw new AssertionError (x);
         }
     }
     
     /**
      * Returns <code>true</code> if the two hashes are equal,
      * <code>false</code> if not. Subclasses must override.
      *
      * @param obj {@inheritDoc}
      * @return <code>true</code> if the receiver is equal to <code>obj</code>
      */
     public abstract boolean equals(Object obj);

 }
